Knettishall Heath is a 91.7-hectare (227-acre) biological Site of Special Scientific Interest west of Knettishall in Suffolk. A larger area of 176 hectares is the Knettishall Heath Nature Reserve, which is managed by the Suffolk Wildlife Trust.
Wayland Wood is a 31.7-hectare (78-acre) biological Site of Special Scientific Interest near to Watton in Norfolk. It is a Nature Conservation Review site, Grade 2, and it is managed by the Norfolk Wildlife Trust
Stones Road Pond is a 0.5-hectare (1.2-acre) biological Site of Special Scientific Interest (SSSI) in Epsom in Surrey.
Thompson Water, Carr and Common is a 154.7-hectare (382-acre) biological Site of Special Scientific Interest north of Thetford in Norfolk. Most of it is managed by the Norfolk Wildlife Trust as Thompson Common. It is a Nature Conservation Review site, Grade I, and part of the Norfolk Valley Fens Special Area of Conservation. It is crossed by the Great Eastern Pingo Trail Local Nature Reserve.
Blo' Norton and Thelnetham Fens are a 21.3-hectare (53-acre) biological Site of Special Scientific Interest (SSSI) on the Norfolk/Suffolk border. Blo' Norton Fen is in the parish of Blo' Norton in Norfolk and Thelnetham Fen is in Thelnetham parish in Suffolk. It is a Nature Conservation Review site, Grade 2, and part of the Waveney and Little Ouse Valley Fens Special Area of Conservation, Thelnetham Fen is managed by the Suffolk Wildlife Trust and Blo' Norton Fen by the Little Ouse Headwaters Project (LOHP).
East Wretham Heath is a 141.1-hectare (349-acre) biological Site of Special Scientific Interest south-east of Thetford in Norfolk. It is a Nature Conservation Review site, Grade I, and it is managed by the Norfolk Wildlife Trust. it is part of the Breckland Special Area of Conservation and Special Protection Area.
Weeting Heath is a 141.8-hectare (350-acre) biological Site of Special Scientific Interest west of Thetford in Norfolk, which is managed by the Norfolk Wildlife Trust. It is a Nature Conservation Review site, Grade I, and a National Nature Reserve. It is also part of the Breckland Special Area of Conservation and Special Protection Area.
Madingley Wood is a 15.4-hectare (38-acre) biological Site of Special Scientific Interest near Madingley, on the western outskirts of Cambridge.
Short Wood and Southwick Wood is a 54.7-hectare (135-acre) nature reserve north-west of Oundle in Northamptonshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. Short Wood is a 25.3-hectare (63-acre) biological Site of Special Scientific Interest.
Little Heath, Barnham lies south-west of Barnham, Suffolk. Much of the area is now a Site of Special Scientific Interest, which almost surrounds the former chemical weapon store and filling station (FFD1)
Thetford Heaths is a 270.6-hectare (669-acre) biological and geological Site of Special Scientific Interest in Suffolk. It is a Nature Conservation Review site, Grade I, and parts of it are a national nature reserve, and a Geological Conservation Review, It is part of the Breckland Special Area of Conservation, and Special Protection Area A large part of this dry heathland site is calcareous grassland, and some areas are grazed by sheep or rabbits. There are several nationally rare plants and an uncommon heathland bird, and many lichens and mosses.
Barnham Cross Common is a 69.1-hectare (171-acre) biological Site of Special Scientific Interest on the southern outskirts of Thetford in Norfolk. It is owned by Thetford Town Council and is registered common land. It is also a Local Nature Reserve and a Nature Conservation Review site, Grade 1. It is part of the Breckland Special Area of Conservation and Special Protection Area.
Bridgham and Brettenham Heaths is a 439.9-hectare (1,087-acre) biological Site of Special Scientific Interest north-east of Thetford in Norfolk, England. It is a Nature Conservation Review site, Grade I, and part of the Breckland Special Area of Conservation and Special Protection Area. Brettenham Heath is a National Nature Reserve.
Cranwich Camp is a 13.1-hectare (32-acre) biological Site of Special Scientific Interest north-west of Thetford in Norfolk. It is part of the Breckland Special Area of Conservation and Special Protection Area.
East Harling Common is a 15.1-hectare (37-acre) biological Site of Special Scientific Interest east of Thetford in Norfolk.
Horse Wood, Mileham is a 7.1-hectare (18-acre) biological Site of Special Scientific Interest north-west of Dereham in Norfolk.
Stanford Training Area SSSI is part of the British Army Stanford Training Area. It is a 4,678-hectare (11,560-acre) biological and geological Site of Special Scientific Interest north of Thetford in Norfolk. It is a Nature Conservation Review site and part of it is a Geological Conservation Review site. It is also part of the Breckland Special Area of Conservation and Special Protection Area.
Thetford Golf Course and Marsh is a 122.3-hectare (302-acre) biological Site of Special Scientific Interest on the western outskirts of Thetford in Norfolk. It is a Nature Conservation Review site, Grade 2, and part of the Breckland Special Area of Conservation and Special Protection Area.
Field Barn Heaths, Hilborough is a 17.9-hectare (44-acre) biological Site of Special Scientific Interest north-west of Hilborough in Norfolk. It is part of the Breckland Special Area of Conservation and Special Protection Area.
Wretham Park Meres is a 30-hectare (74-acre) biological Site of Special Scientific Interest north of Thetford in Norfolk.
